The kid in class who slows down the rest by having to get every last thing repeated to him/her 8 times before understanding it.
Teacher 1) I hear you got Tommy and Linda in English class. I had them last year. They're some really bright kids.

Teacher 2) Yeah, but I feel horrible. It's damn near Christmas and we still haven't finished basic sentence structure because Kyle still doesn't understand subject-verb agreement and he asks me 2 dozen questions per class that I've already answered.

Teacher 1) That's always so unfortunate, when the brightest in the bunch are put in the same classes as the Slowest Common Denominator.

Teacher 2) Yeah. I wish there was room in the budget to have more advanced classes.
by daphunkeefeel1 July 13, 2012
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1. The number underneath in a fraction after simplification

2. A dumbass or a group of dumbasses
1. "I got half marks in that maths test because I didn't simplify to the lowest common denominator"

2. "I got into a fight with a group of the lowest common denominator, mate"
by psychedelic_fuzz May 30, 2007
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The most logically-challenged portion of the general population for which the most obvious warnings, posts, signs and instructions must be written or designed to avoid catastrophe.
On the lid of the coffee cup: Contents may be hot.
On a package of kitchen knives: Caution! Items are sharp.
On a trash bag: Do not place over head.
At a railroad crossing: No parking.
On a clothes dryer: Do not place children or animals inside.

"This is the dumbest sign I've ever seen. Do they think I'm a complete moron?"

"Dude. Gotta plan for the Dumbest Common Denominator."
by Upallnightagain September 25, 2011
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The first person at the front of a single line of moving traffic.
1st guy) Why is this traffic moving so slow.
2nd guy) There's a guy ahead of us that is driving the exact speed limit.
1st guy) He's the slowest common denominator
by escyr July 10, 2012
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A decision based on those making the most noise over a certain issue.
"Did you order the veggie pizza I wanted?"
"Nope, sausage. I had to go with the Loudest Common Denominator."
by denabee November 28, 2011
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In relation to people, they are the simplest group in a population. They have the simplest opinions, the simplest views and the simplest lifestyles. They are the unsophisticated (which is not correlated to the amount of happiness they have - in fact, living a simple life may make you even more happy than living a sophisticated one). Because these people do not think as much as a sophisticated person, they tend to be more naive and more gullible to gut feelings, and the ingrained culture and social laws that are around them. Their trust is easily earned.

In terms of politics, this can be taken advantage of when politicians use their persona and the gut feelings of their audience to gain followers, even when their policies and views might be to their disadvantage.
Those GOP candidates like to target the lowest common denominators in each state because it's easy followers for them. I mean, who would follow Rick Santorum because of a sweater vest?
by Bluestjay February 22, 2012
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Phrase meaning base or crass. Used to describe ideas associated with sex or innuendo. Similar to the phrase "his mind is in the gutter."
"It's embarrassing inviting Dave to my parents' house; he always takes the conversation to the lowest common denominator."
by Shumado January 16, 2012
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